[s-cars] 80tq Update: 516 wheel hp, 450 wheel TQ
mlp
mlped at qwest.net
Wed Mar 9 15:59:05 EST 2005
Sorry Chris, but if its any help in the argument, I'm still a hold out for
well done head as a major variable as well..... So, on a related note, for
those who may be wondering
Stock 32 mm Intake Valve per Machinist's scales 50.0 grams
32.5mm nitrided (?) Stainless "flared" 47.0 grams
***********
Stock Spring retainer 19.- grams
Titanium retainer 10.- grams
*******
Stock 28mm sodium filled exhaust valve 47.5 grams
Ferrea "special alloy" 29mm ?P#1493P (+2000 F°) 51.0 grams
FWIW, an earlier weighing at another shop, reported different weight for the
stock valves, 46 grams (?) for both 32mm intake & 28mm exhaust. That may be
a transcription reporting or entry errors. Maybe some one else can check
the stock valve and retainer weights?
As for effects, FWIW & YMMV etc., going from (1) a base, stock head with a
fresh multiangle (in this case a 5, I think, but the valve seat job was/is
the same in each case); to (2) porting using a flow bench etc. alone done by
some one with some experience in working on the 20v head; to (3) port plus
"+" sized valves, one can claim the following percentage improvements as
measured by the flow bench:
EXHAUST flow increase/decrease as % based on Ported flow/stock and Ported
plus "+1" valve flow/base
Ported Only Port & + Valve Port +Valve
Lift vs. Stock vs. stock v Ported Only
0.050 116.9% 121.2% 103.7%
0.100 121.2% 130.1% 107.3%
0.150 126.6% 139.4% 110.1%
0.200 117.5% 130.4% 111.0%
0.250 112.8% 127.4% 112.9%
0.300 111.4% 135.3% 121.5%
0.350 113.1% 133.9% 118.4%
0.400 115.7% 133.6% 115.5%
total 116.0% 132.4% 114.2%
INTAKE flow increase/decrease again as a % of base flow results:
lift"
0.050 112.0% 114.7% 102.4%
0.100 117.1% 120.2% 102.7%
0.150 114.0% 117.8% 103.3%
0.200 110.9% 116.9% 105.4%
0.250 111.5% 114.3% 102.5%
0.300 109.8% 114.6% 104.4%
0.350 109.6% 116.8% 106.6%
0.400 109.5% 119.1% 108.8%
total 111.0% 116.7% 105.2%
What this would mean on the street, in a car, if anything, I'll leave the
list performance mavens to explain.
HTH some one
mike
>-----Original Message-----
>From: s-car-list On Behalf Of Leal, Christopher
>Remembering that Javad's setup has no Mass Air Sensor or
>restrictive air cleaner and an intercooler that has a larger
>cross section than the Happerunit, I would suspect that the
>only advantage your car has, as you suggested, would be the
>throttle body and intake.
>
>Hap, Keep up the bling factor and you'll have another trophy
>for your collection. Love your car. Please don't get carried
>away and show up with a gold front tooth and Dubs at the next
>nationals. :-#
>
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